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Schlagwort: brazing

The series of successes is showing no signs of stopping: From June 12 to 14, 270 participants and 17 exhibitors from 27 countries used the 10th International "Aluminium Brazing 2018" Congress with an Exhibition in Düsseldorf in order to exchange experience. Together with DVS Media GmbH, the German Welding Society (DVS) successfully staged this international event for the fourth time already.

The organisers and the exhibitors were pleased to establish the constantly growing number of participants in the congress. At the same time, they were also able to register an increase in guests from the Asian region, such as Korea or China.

Dr. Hans-Walter Swidersky, Mentor of Aluminium Brazing, greeted the numerous participants and Dr.-Ing. Hartmut Schmoor, Chairman of the "Brazing/Soldering" Specialist Society in DVS, delivered the welcoming address on the occasion of the opening ceremony. Subsequently, the speakers from all over the world of aluminium brazing provided information. In this respect, the selection of the lectures about the subject areas of materials, testing, applications, equipment, quality management, process control as well as research and development met with great approval amongst the listeners. "Highly interesting, relevant to practice and exciting" was the tenor.

The accompanying exhibition was also received positively and thus well-visited. Here, there were a lot of intensive expert discussions about all aspects of the subject of aluminium brazing. Because all the participants and exhibitors concentrated on "networking" this time too.

With regard to technical relevance, establishing contacts as well as framework conditions, the vast majority of the participants rated the event as good to very good. Thus, two thirds now already know that they definitely want to come again. The next Aluminium Brazing will again take place in Düsseldorf at the end of April 2020.

Holo/OR, industrial partner of LASER COMPONENTS, has developed a diffractive optical element (DOE) that significantly accelerates the laser brazing process for hot-dip galvanized metal sheets. It provides better melting performance and cleaner edges. The DOE made of UV fused silica has an efficiency of 90%. It splits the incoming beam into three beams with different diameters and power levels. Two smaller stripping beams ensure that the zinc coating is preheated, cleaned and preconditioned for brazing. The large center beam performs the actual brazing process. Its homogeneous energy distribution ensures that the brazing material is melted evenly. So far, similar results could only be achieved with several lasers or complex optomechanical elements.

Laser brazing uses a laser to melt the brazing material and join two metallic components together. In contrast to the welding process, the parts themselves are only minimally heated. In the case of hot-dip galvanized sheets, this means that the zinc layer evaporates only in a very limited area and the sheets are hardly deformed during processing. Providing connections with high mechanical stability without impairing the corrosion protection, laser brazing has become an important process in the automotive industry. On the other hand, oxides and impurities in the zinc layer of the soldered seam can cause irregularities such as splashes, pores or uneven surfaces. This effect is now prevented by the new DOE.